The Bi-fold Patio Door Estimating Calculator estimates the materials, labour and plant associated with fitting a Bi-fold Patio Door.

This estimating calculator is linked to the Specification. Items relating to the structural opening and finishes are taken from the Specification.

The information taken from the Specification, along with the options you select from the door specifier and the dimensions you enter, will be used to calculate the following items:

  • Doors
  • Lintels
  • Frame fixings
  • Cavity closer
  • Threshold board
  • DPCs
  • Door furniture
  • Plastering
  • Decoration
  • Labour associated with the above


  • To fit a bi-fold patio door into an existing wall, use the Bi-fold Patio Door to Existing Wall Estimating Calculator. This will estimate the cost of forming the opening and removing the spoil.